<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <form>
        <div class="userNname">
            <label for="user">用户名:</label>
            <input type="text" name="" id="user">
            <span style="font-size: 10px"></span>
        </div>
        <div class="btn">
            <button>检测</button>
        </div>
    </form>

    <script src="./js/ajax.js"></script>
    <script src="./js/checkUser.js"></script>
</body>

</html> 